As a technician you are confronted with a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips, but the readings are inconclusive because of their erratic nature. Of the possible faults listed, select the one that most probably is causing the problem.

Digital logic is the underlying logic system that drives electronic circuit board design. Digital logic manipulates of binary values through printed circuit board technology that uses circuits and logic gates to construct the implementation of computer operations.